Wow, there are some good ones on both of your lists.
1. Pang (stealing this one as it's such a great idea)
2. Sunset Riders (A release with both the Mega Drive and Arcade versions would be awesome!)
3. Simpsons Arcade
4. Chaos (A brilliant strategy game released on Spectrum)
5. Base Jumpers (Amiga - with updated physics and controls)
6. Snatcher (Mega CD - BRILLIANT game)
7. Shenmue 1&2 (Dreamcast - achivements for obtaining all the collectibles?

)
8. Moonwalker (Mega Drive version - it was just good and I'd like to see it)
9. Toejam & Earl (Mega Drive - one of my favourite 2 player games on MD. I know it was announced for XBLA, but we haven't heard anything in a while so I'm getting worried...

)
10. Tombi (PS1 - Tomba in the states. A brilliant platformer. I never actually had the full game in the end, but I played the demo over and over. The game wasn't that easy to come by. I would LOVE a re-release. Klonoa got it on the Wii, so why not?

)